Weight loss drugs are proving to be super popular among many workers with job-based health insurance. But GLP-1 medications are busting their employers’ budgets, leading some firms to rethink their coverage.

The share of very large firms covering these drugs for obesity soared to 43 percent this year, up from 28 percent last year, according to KFF’s latest annual Employer Health Benefits Survey, which was released on Wednesday. These employers, who have more than 5,000 workers, are much more likely than their smaller counterparts to offer such a benefit.

Among firms with between 200 and 999 staffers, only 16 percent provide coverage of drugs for weight loss this year, the same as last year, according to KFF, a nonpartisan health policy research group.

GLP-1 drugs, which treat diabetes,

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